package com.sky.service.admin.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.RedisConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.common.CategoryMapper;
import com.sky.mapper.common.DishMapper;
import com.sky.mapper.common.SetmealMapper;
import com.sky.pojo.Category;
import com.sky.result.PageResult;
import com.sky.service.admin.CategoryService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 分类业务层
 */
@Service
@Slf4j
@Transactional(propagation = Propagation.REQUIRED, isolation = Isolation.DEFAULT, readOnly = true)
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private RedisTemplate redisTemplate;



    /**
     * 新增分类
     * @param categoryDTO
     */
    @Transactional(readOnly = false)
    public void save(CategoryDTO categoryDTO) throws CloneNotSupportedException {
        Category category = categoryDTO.clone();
        //设置时间和操作人
        category.setCreateTime(LocalDateTime.now());
        category.setUpdateTime(LocalDateTime.now());
        category.setCreateUser(BaseContext.getCurrentId());
        category.setUpdateUser(BaseContext.getCurrentId());

        //分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE);
        categoryMapper.insert(category);
        //   将缓存数据 清理
        redisTemplate.delete(RedisConstant.CATEGORY_LIST+categoryDTO.getType());
    }

    /**
     * 分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
        //下一条sql进行分页，自动加入limit关键字分页
        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 根据id删除分类
     * @param id
     */
    @Transactional(readOnly = false)
    public void deleteById(Long id) {
        //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
        Integer count = dishMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
        count = setmealMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);

    }

    /**
     * 修改分类
     * @param categoryDTO
     */
    @Transactional(readOnly = false)
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        //设置修改时间和修改人
        category.setUpdateTime(LocalDateTime.now());
        category.setUpdateUser(BaseContext.getCurrentId());
        BeanUtils.copyProperties(categoryDTO,category);
        categoryMapper.update(category);

        redisTemplate.delete(RedisConstant.CATEGORY_LIST + categoryDTO.getType());
    }

    /**
     * 启用、禁用分类
     * @param status
     * @param id
     */
    @Transactional(readOnly = false)
    public void startOrStop(Integer status, Long id) {
        Category category = Category.builder()
                .id(id)
                .status(status)
                .updateTime(LocalDateTime.now())
                .updateUser(BaseContext.getCurrentId())
                .build();
        categoryMapper.update(category);


    }

    /**
     * 根据类型查询分类
     * @param type =1  菜品分类    type= 2  套餐分类
     * 优化：
     *     对于查询比较频繁且数据变化不频繁的可以使用redis来缓存
     *      推荐的数据格式是String
     * @return
     */
    public List<Category> list(Integer type) {
        //1. 首先从redis中查询数据 如果有则直接返回给用户
        List<Category> list = (List<Category>) redisTemplate.opsForValue().get(RedisConstant.CATEGORY_LIST + type);
        if(null == list){
            //2. 如果没有则从数据库中查询数据 然后添加到redis 最后返回给用户
            list = categoryMapper.list(type);
            redisTemplate.opsForValue().set(RedisConstant.CATEGORY_LIST + type, list);
        }

        return list;
    }
}
